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Reversible tunneling rearrangement between 1 and 2. After deposition of the matrix at 3 K, 1 rearranges slowly (hours) to 2 via tunneling. Subsequent annealing at 25 K results in the fast (minutes) formation of complexes of 1 and 2 with H2O or CF3I, respectively. After cooling back to 3 K, the complexes of 2 slowly (hours) rearrange to 1.
